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x in (-oo:+oo)
20/25 = x/5 // - x/5
20/25-(x/5) = 0
4/5-1/5*x = 0 // - 4/5
-1/5*x = -4/5 // : -1/5
x = -4/5/(-1/5)
x = 4
x = 4
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